Identity Propagation through Application Layers Using Contextual Mapping and Planted Values

ABSTRACT

Mechanisms are provided for propagating source identification information from an application front-end system in an application layer to a data layer inspection system associated with a back-end system. An incoming user request is received, at the data layer inspection system, from a gateway system associated with the application front-end system. One or more outgoing statements targeting a back-end system are received at the data layer inspection system. The data layer inspection system accesses a mapping data structure based on the one or more outgoing statements to thereby correlate the one or more outgoing statements with the incoming user request. The data layer inspection system retrieves source identification information associated with the incoming user request based on the correlation of the one or more outgoing statements with the incoming user request. The data layer inspection system performs a data layer inspection operation based on the source identification information.

BACKGROUND

The present application relates generally to an improved data processingapparatus and method and more specifically to mechanisms for identitypropagation through application layers using contextual mapping andplanted values.

Modern information processing environments are experiencing a trend fromthe traditional client-server model to an application-server model.While the client-server model categorizes information resources asservices to a client, an application-based architecture allows eachapplication to perform specific and/or specialized portions ofprocessing before handing a transaction or data stream off to asuccessive processing tier. An application-server model may exhibit aso-called multi tier arrangement or architecture. In a multi-tierarrangement, each tier is responsible for performing a particular aspectof processing. Tiers communicate by passing or transmitting data, oftenaccording to a predetermined protocol or data structure. A businesstransaction is therefore passed between tiers, which may be successivelayers or nodes in the processing stream. According, each tier, or“layer,” receives a transaction from a preceding layer.

Each tier/layer may perform particular functions, such as databasequeries, XML parsing, tunneling, protocol mapping, network transport, orGUI (graphical user interface) operations, for example. At each tier,attributes of the transaction or data stream are communicated to thenext tier. However, certain attributes may be suppressed or omitted ifthose attributes are deemed unnecessary at the successive tier.Therefore, in a multi-tier arrangement, while scaling, informationscope, and function consolidation may be improved, certain attributes ofthe transaction or information stream may not be propagated as readilyas in conventional client server arrangements. Operations or functionsthat expect certain attributes available at a particular layer mayencounter difficulty (i.e. unavailability) if they rely on thatattribute.

One set of examples in which information is lost between operationsperformed at different tiers/layers of an application-server model basedsystem are security functions, such as audit trails or the like. Almostall security functions are based on a credential. Audit trails key onthe identity of a user or client machine (e.g., produce a report showingall activity performed by the user or client machine), access controlkeys on the identity (e.g., user X should not be allowed to access dataY), and the like.

In some cases, the security function is provided by the same layer thatprovides the identity layer. For example, when a user connects directlyto a database there is a user name that is used to log onto thedatabase. The same user name is also used to define privileges in thedatabase system and the same name appears in the audit trail generatedby audit security mechanisms. This is true regardless of whether thedatabase itself is the system enforcing access control rules andperforming the auditing or an external security system performs thesefunctions. Because the user name used for the security functions ismanaged by the database security tier, it is meaningful to the securityoperator, who defines privileges or reviews the audit trail.

However, there are cases in which the security function is provided atone tier while the identity is provided by another tier. A very commoncase involves application servers that use a database as their back-end.In such cases, the application is the tier responsible for managing theidentities. A user logs onto the application and provides, for example,a user name and a password. The application will typically utilize adatabase on the back-end to store and manage the data used or accessedvia the application. The application server uses connections to thedatabase.

In client/server architectures there is usually a connection to thedatabase for every user and often the credential used to log onto theapplication is also used to generate the connection to the database,i.e. for every user of the application there is also a user at thedatabase level. However, in the much more common application-serverbased architecture, this is not true. Instead, the application servermaintains a pool of connections to the database. These connections areall created when the application server first starts and they all use asingle functional account, i.e. the connections are all associated witha single functional identifier for the application front-end withoutdistinguishing between users of the application front-end. Theseconnections are reused by all user sessions, i.e. multiplexing is used.That is, when a user logs onto the application front-end, a session iscreated with the application front-end and the application front-endgets a connection from the database's connection pool and assigns it tothe session. When the session ends, the connection is released back tothe pool and may be reused by the application front-end for anothersession. This is done to increase performance and reduce overhead.

From a security point of view, however, this connection pool mechanismcauses a serious problem. The identity of the user is lost from theviewpoint of the database layer, i.e. the user identity is not passed tothe database back-end, and only exists at the application layer, i.e. atthe application front-end. For example, if one were to look at an audittrail produced by an audit mechanism operating at the database layer,such as an audit mechanism of the database itself or a Database ActivityMonitoring (DAM) system, then all activity is shown to have beenperformed by the entity logged onto the database, i.e. the functionalaccount of the application which is identified by a functionalidentifier. However, what a human auditor, or automated securitymechanism wants to be able to see in the audit trail is which end-userof the application layer caused the particular database query to beissued and therefore, which user was able to access certain sensitivedata. The audit trail provides little useful information from a securitypoint of view because the “real identity” of the end-user is notpropagated through the application layer. While an application layeraudit trail could be used, it is often a data-level audit trail that isrequired for particular security mechanisms and this can only beperformed at the database layer.

SUMMARY

In one illustrative embodiment, a method, in a data processing system,is provided for propagating source identification information from anapplication front-end system in an application layer to a data layerinspection system associated with a back-end system. The methodcomprises receiving, at the data layer inspection system, an incominguser request from a gateway system, in the application layer, associatedwith the application front-end system. The method further comprisesreceiving, at the data layer inspection system, one or more outgoingstatements targeting the back-end system and being generated by theapplication front-end system based on the received incoming userrequest. Moreover, the method comprises accessing, by the data layerinspection system, a mapping data structure based on the one or moreoutgoing statements to thereby correlate the one or more outgoingstatements with the incoming user request. In addition, the methodcomprises retrieving, by the data layer inspection system, sourceidentification information associated with the incoming user requestbased on the correlation of the one or more outgoing statements with theincoming user request. Additionally, the method comprises performing, bythe data layer inspection system, a data layer inspection operationbased on the source identification information.

In other illustrative embodiments, a computer program product comprisinga computer useable or readable medium having a computer readable programis provided. The computer readable program, when executed on a computingdevice, causes the computing device to perform various ones, andcombinations of, the operations outlined above with regard to the methodillustrative embodiment.

In yet another illustrative embodiment, a system/apparatus is provided.The system/apparatus may comprise one or more processors and a memorycoupled to the one or more processors. The memory may compriseinstructions which, when executed by the one or more processors, causethe one or more processors to perform various ones, and combinations of,the operations outlined above with regard to the method illustrativeembodiment.

These and other features and advantages of the present invention will bedescribed in, or will become apparent to those of ordinary skill in theart in view of, the following detailed description of the exampleembodiments of the present invention.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The invention, as well as a preferred mode of use and further objectivesand advantages thereof, will best be understood by reference to thefollowing detailed description of illustrative embodiments when read inconjunction with the accompanying drawings, wherein:

FIG. 1 depicts a pictorial representation of an example distributed dataprocessing system in which aspects of the illustrative embodiments maybe implemented;

FIG. 2 is an example block diagram of an example data processing systemin which aspects of the illustrative embodiments may be implemented;

FIG. 3 is an example block diagram of a system for generating a mappingspecification for mapping front-end incoming user requests to outgoingback-end requests in accordance with one illustrative embodiment;

FIG. 4 is an example block diagram of a system for auditing accesses toa back-end system using mapping information generated during a learningmode of operation in accordance with one illustrative embodiment;

FIG. 5 is a flowchart outlining an example operation of a gateway systemduring a learning mode of operation in accordance with one illustrativeembodiment;

FIG. 6 is a flowchart outlining an example operation of an inspectionsystem during a learning mode of operation in accordance with oneillustrative embodiment;

FIG. 7 is a flowchart outlining an example operation of a gateway systemduring a runtime mode of operation in accordance with one illustrativeembodiment; and

FIG. 8 is a flowchart outlining an example operation of an inspectionsystem during a runtime mode of operation in accordance with oneillustrative embodiment.

DETAILED DESCRIPTION

The illustrative embodiments provide mechanisms for identity propagationthrough application layers using contextual mapping and planted values.The mechanisms of the illustrative embodiments solve the issues notedabove by providing a non-intrusive matching mechanism for identitypropagation, i.e. a matching mechanism that does not require changes toapplication front-end code. Moreover, the matching mechanism of theillustrative embodiments is precise since it uses inserted or plantedunique values that are easily identifiable and are not values that mayappear from multiple database queries.

The illustrative embodiments operate on the basic premise that it ispossible to manipulate the incoming user based requests to theapplication layer, plant uniquely identifiable values into theserequests, and monitor the impact on the outgoing database requests,e.g., the SQL statements generated by the application layer and sent tothe database layer. In a learning mode of operation, the mechanisms ofthe illustrative embodiments utilize this matching of unique values inthe incoming user requests to the application tier/layer with the sameunique values in the outgoing database requests as a way of learning therelationship between certain types, or patterns, of incoming userrequests and the resulting outgoing database requests. Once thislearning is accomplished, the results of the learning are used toperform mapping during runtime so as to generate database layer audittrails, i.e. audit trails generated by an audit mechanism operating atthe database layer rather than an application layer, having useridentity information. That is, during runtime operation, the uniquevalue planting mechanisms are not used but instead the learned mappingof incoming user request to outgoing database request(s) or statement(s)is used to correlate an incoming user request with subsequent outgoingdatabase request(s)/statement(s) and a corresponding audit trail havingthe user identifier for the user issuing the original incoming userrequest is generated. This audit trail may then be used by an auditor toidentify which user was able to access sensitive data on the databasesystem.

As will be appreciated by one skilled in the art, the present inventionmay be embodied as a system, method, or computer program product.Accordingly, aspects of the present invention may take the form of anentirely hardware embodiment, an entirely software embodiment (includingfirmware, resident software, micro-code, etc.) or an embodimentcombining software and hardware aspects that may all generally bereferred to herein as a “circuit,” “module” or “system.” Furthermore,aspects of the present invention may take the form of a computer programproduct embodied in any one or more computer readable medium(s) havingcomputer usable program code embodied thereon.

Any combination of one or more computer readable medium(s) may beutilized. The computer readable medium may be a computer readable signalmedium or a computer readable storage medium. A computer readablestorage medium may be, for example, but not limited to, an electronic,magnetic, optical, electromagnetic, infrared, or semiconductor system,apparatus, device, or any suitable combination of the foregoing. Morespecific examples (a non-exhaustive list) of the computer readablestorage medium would include the following: an electrical connectionhaving one or more wires, a portable computer diskette, a hard disk, arandom access memory (RAM), a read-only memory (ROM), an erasableprogrammable read-only memory (EPROM or Flash memory), an optical fiber,a portable compact disc read-only memory (CDROM), an optical storagedevice, a magnetic storage device, or any suitable combination of theforegoing. In the context of this document, a computer readable storagemedium may be any tangible medium that can contain or store a programfor use by or in connection with an instruction execution system,apparatus, or device.

A computer readable signal medium may include a propagated data signalwith computer readable program code embodied therein, for example, in abaseband or as part of a carrier wave. Such a propagated signal may takeany of a variety of forms, including, but not limited to,electro-magnetic, optical, or any suitable combination thereof. Acomputer readable signal medium may be any computer readable medium thatis not a computer readable storage medium and that can communicate,propagate, or transport a program for use by or in connection with aninstruction execution system, apparatus, or device.

Computer code embodied on a computer readable medium may be transmittedusing any appropriate medium, including but not limited to wireless,wireline, optical fiber cable, radio frequency (RF), etc., or anysuitable combination thereof.

Computer program code for carrying out operations for aspects of thepresent invention may be written in any combination of one or moreprogramming languages, including an object oriented programming languagesuch as Java™, Smalltalk™, C++, or the like, and conventional proceduralprogramming languages, such as the “C” programming language or similarprogramming languages. The program code may execute entirely on theuser's computer, partly on the user's computer, as a stand-alonesoftware package, partly on the user's computer and partly on a remotecomputer, or entirely on the remote computer or server. In the latterscenario, the remote computer may be connected to the user's computerthrough any type of network, including a local area network (LAN) or awide area network (WAN), or the connection may be made to an externalcomputer (for example, through the Internet using an Internet ServiceProvider).

Aspects of the present invention are described below with reference toflowchart illustrations and/or block diagrams of methods, apparatus(systems) and computer program products according to the illustrativeembodiments of the invention. It will be understood that each block ofthe flowchart illustrations and/or block diagrams, and combinations ofblocks in the flowchart illustrations and/or block diagrams, can beimplemented by computer program instructions. These computer programinstructions may be provided to a processor of a general purposecomputer, special purpose computer, or other programmable dataprocessing apparatus to produce a machine, such that the instructions,which execute via the processor of the computer or other programmabledata processing apparatus, create means for implementing thefunctions/acts specified in the flowchart and/or block diagram block orblocks.

These computer program instructions may also be stored in a computerreadable medium that can direct a computer, other programmable dataprocessing apparatus, or other devices to function in a particularmanner, such that the instructions stored in the computer readablemedium produce an article of manufacture including instructions thatimplement the function/act specified in the flowchart and/or blockdiagram block or blocks.

The computer program instructions may also be loaded onto a computer,other programmable data processing apparatus, or other devices to causea series of operational steps to be performed on the computer, otherprogrammable apparatus, or other devices to produce a computerimplemented process such that the instructions which execute on thecomputer or other programmable apparatus provide processes forimplementing the functions/acts specified in the flowchart and/or blockdiagram block or blocks.

The flowchart and block diagrams in the figures illustrate thearchitecture, functionality, and operation of possible implementationsof systems, methods and computer program products according to variousembodiments of the present invention. In this regard, each block in theflowchart or block diagrams may represent a module, segment, or portionof code, which comprises one or more executable instructions forimplementing the specified logical function(s). It should also be notedthat, in some alternative implementations, the functions noted in theblock may occur out of the order noted in the figures. For example, twoblocks shown in succession may, in fact, be executed substantiallyconcurrently, or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved. It will also be notedthat each block of the block diagrams and/or flowchart illustration, andcombinations of blocks in the block diagrams and/or flowchartillustration, can be implemented by special purpose hardware-basedsystems that perform the specified functions or acts, or combinations ofspecial purpose hardware and computer instructions.

As will be appreciated, the illustrative embodiments may be utilized inmany different types of data processing environments including adistributed data processing environment, a single data processingdevice, or the like. In order to provide a context for the descriptionof the specific elements and functionality of the illustrativeembodiments, FIGS. 1 and 2 are provided hereafter as exampleenvironments in which aspects of the illustrative embodiments may beimplemented. It should be appreciated that FIGS. 1-2 are only examplesand are not intended to assert or imply any limitation with regard tothe environments in which aspects or embodiments of the presentinvention may be implemented. Many modifications to the depictedenvironments may be made without departing from the spirit and scope ofthe present invention.

With reference now to the figures, FIG. 1 depicts a pictorialrepresentation of an example distributed data processing system in whichaspects of the illustrative embodiments may be implemented. Distributeddata processing system 100 may include a network of computers in whichaspects of the illustrative embodiments may be implemented. Thedistributed data processing system 100 contains at least one network102, which is the medium used to provide communication links betweenvarious devices and computers connected together within distributed dataprocessing system 100. The network 102 may include connections, such aswire, wireless communication links, or fiber optic cables.

In the depicted example, server 104 and server 106 are connected tonetwork 102 along with storage unit 108. In addition, clients 110, 112,and 114 are also connected to network 102. These clients 110, 112, and114 may be, for example, personal computers, network computers, or thelike. In the depicted example, server 104 provides data, such as bootfiles, operating system images, and applications to the clients 110,112, and 114. Clients 110, 112, and 114 are clients to server 104 in thedepicted example. Distributed data processing system 100 may includeadditional servers, clients, and other devices not shown.

In the depicted example, distributed data processing system 100 is theInternet with network 102 representing a worldwide collection ofnetworks and gateways that use the Transmission ControlProtocol/Internet Protocol (TCP/IP) suite of protocols to communicatewith one another. At the heart of the Internet is a backbone ofhigh-speed data communication lines between major nodes or hostcomputers, consisting of thousands of commercial, governmental,educational and other computer systems that route data and messages. Ofcourse, the distributed data processing system 100 may also beimplemented to include a number of different types of networks, such asfor example, an intranet, a local area network (LAN), a wide areanetwork (WAN), or the like. As stated above, FIG. 1 is intended as anexample, not as an architectural limitation for different embodiments ofthe present invention, and therefore, the particular elements shown inFIG. 1 should not be considered limiting with regard to the environmentsin which the illustrative embodiments of the present invention may beimplemented.

With reference now to FIG. 2, a block diagram of an example dataprocessing system is shown in which aspects of the illustrativeembodiments may be implemented. Data processing system 200 is an exampleof a computer, such as client 110 in FIG. 1, in which computer usablecode or instructions implementing the processes for illustrativeembodiments of the present invention may be located.

In the depicted example, data processing system 200 employs a hubarchitecture including north bridge and memory controller hub (NB/MCH)202 and south bridge and input/output (I/O) controller hub (SB/ICH) 204.Processing unit 206, main memory 208, and graphics processor 210 areconnected to NB/MCH 202. Graphics processor 210 may be connected toNB/MCH 202 through an accelerated graphics port (AGP).

In the depicted example, local area network (LAN) adapter 212 connectsto SB/ICH 204. Audio adapter 216, keyboard and mouse adapter 220, modem222, read only memory (ROM) 224, hard disk drive (HDD) 226, CD-ROM drive230, universal serial bus (USB) ports and other communication ports 232,and PCI/PCIe devices 234 connect to SB/ICH 204 through bus 238 and bus240. PCI/PCIe devices may include, for example, Ethernet adapters,add-in cards, and PC cards for notebook computers. PCI uses a card buscontroller, while PCIe does not. ROM 224 may be, for example, a flashbasic input/output system (BIOS).

HDD 226 and CD-ROM drive 230 connect to SB/ICH 204 through bus 240. HDD226 and CD-ROM drive 230 may use, for example, an integrated driveelectronics (IDE) or serial advanced technology attachment (SATA)interface. Super I/O (SIO) device 236 may be connected to SB/ICH 204.

An operating system runs on processing unit 206. The operating systemcoordinates and provides control of various components within the dataprocessing system 200 in FIG. 2. As a client, the operating system maybe a commercially available operating system such as Microsoft® Windows®7 (Microsoft and Windows are trademarks of Microsoft Corporation in theUnited States, other countries, or both). An object-oriented programmingsystem, such as the Java™ programming system, may run in conjunctionwith the operating system and provides calls to the operating systemfrom Java™ programs or applications executing on data processing system200 (Java is a trademark of Sun Microsystems, Inc. in the United States,other countries, or both).

As a server, data processing system 200 may be, for example, an IBM®eServer™ System p® computer system, running the Advanced InteractiveExecutive (AIX®) operating system or the LINUX® operating system(eServer, System p, and AIX are trademarks of International BusinessMachines Corporation in the United States, other countries, or bothwhile LINUX is a trademark of Linus Torvalds in the United States, othercountries, or both). Data processing system 200 may be a symmetricmultiprocessor (SMP) system including a plurality of processors inprocessing unit 206. Alternatively, a single processor system may beemployed.

Instructions for the operating system, the object-oriented programmingsystem, and applications or programs are located on storage devices,such as HDD 226, and may be loaded into main memory 208 for execution byprocessing unit 206. The processes for illustrative embodiments of thepresent invention may be performed by processing unit 206 using computerusable program code, which may be located in a memory such as, forexample, main memory 208, ROM 224, or in one or more peripheral devices226 and 230, for example.

A bus system, such as bus 238 or bus 240 as shown in FIG. 2, may becomprised of one or more buses. Of course, the bus system may beimplemented using any type of communication fabric or architecture thatprovides for a transfer of data between different components or devicesattached to the fabric or architecture. A communication unit, such asmodem 222 or network adapter 212 of FIG. 2, may include one or moredevices used to transmit and receive data. A memory may be, for example,main memory 208, ROM 224, or a cache such as found in NB/MCH 202 in FIG.2.

Those of ordinary skill in the art will appreciate that the hardware inFIGS. 1-2 may vary depending on the implementation. Other internalhardware or peripheral devices, such as flash memory, equivalentnon-volatile memory, or optical disk drives and the like, may be used inaddition to or in place of the hardware depicted in FIGS. 1-2. Also, theprocesses of the illustrative embodiments may be applied to amultiprocessor data processing system, other than the SMP systemmentioned previously, without departing from the spirit and scope of thepresent invention.

Moreover, the data processing system 200 may take the form of any of anumber of different data processing systems including client computingdevices, server computing devices, a tablet computer, laptop computer,telephone or other communication device, a personal digital assistant(PDA), or the like. In some illustrative examples, data processingsystem 200 may be a portable computing device which is configured withflash memory to provide non-volatile memory for storing operating systemfiles and/or user-generated data, for example. Essentially, dataprocessing system 200 may be any known or later developed dataprocessing system without architectural limitation.

With reference again to FIG. 1, a user of a client machine, such asclient 110, may log onto an application front-end of anapplication-server system by accessing the application front-end, whichmay be hosted on a server, such as server 104 or 106, for example. Theuser may use a web browser, applet, or the like, provided on the clientmachine 110 to access the application front-end and log onto theapplication front-end by providing a user identifier and correspondingsecurity information, e.g., a user name and password. The applicationfront-end may then perform operations to generate a session to beassociated with the user's interaction with the application front-end,e.g., generate a session token to be associated with the connectionbetween the user's client machine 110 and the application front-end onthe server 104.

In response to user requests, e.g., hypertext transfer protocol (HTTP)requests, for access to data stored on a back-end database associatedwith the application front-end, such as network attached storage 108 orother database associated with the application front-end server 104, theapplication front-end obtains a connection from a connection pool of thedatabase, e.g., database 108 in FIG. 1 for purposes of this example, anduses the obtained connection to send the resulting database queryrequests/statements to the database 108 and to receive responses backfrom the database 108. As discussed above, these connections are onlyassociated with the functional identifier of the application front-endand the user identity information, e.g., username, used by theapplication front-end is not passed along to the database 108.

The illustrative embodiments provide a correlation mechanism that allowsauditing to be performed at a data layer, e.g., at the databaseback-end, while still being able to correlate the audit informationobtained by the audit mechanisms with user identification informationmaintained at the application layer and which is typically lost whenaccessing the data layer. The mechanisms of the illustrative embodimentsinclude mechanisms for intercepting incoming user requests, insertingunique values into the intercepted incoming user requests, and trackingthese unique values in outgoing requests/statements sent to the datalayer, e.g., the database back-end system. This tracking and correlationof incoming requests to outgoing requests/statements allows a mapping tobe generated which can then be used by additional mechanisms used atruntime to collect audit information at the data layer. That is, themapping may be used to correlate requests sent to the database back-endsystem with requests received by the application layer, and then to usercredentials. In this way, the auditing mechanisms operating at the datalayer may be informed of application layer user credential informationcorresponding to accesses of information stored in the database back-endsystem.

The mechanisms of the illustrative embodiments have two modes ofoperation (or phases). In a first mode of operation (or phase), i.e. thelearning mode of operation, the mechanisms of the illustrativeembodiments operate to learn patterns of incoming user requests andcorresponding outgoing requests/statements sent to the database back-endsystem. The mapping of these patterns is used to generate aspecification, or set of specifications, that may be used during asecond mode operation, i.e. the runtime mode of operation. During theruntime mode of operation, the specification(s) is/are used to identifyoutgoing requests sent to the database back-end system and correlatethese outing requests with incoming user requests received by theapplication layer front-end system. The incoming user requests include asession identifier which can then be used to correlate the incoming userrequest with a particular user identifier. The user identifier can thus,be associated with the outgoing requests sent to the database back-endsystem for auditing or other tracking purposes.

FIG. 3 is an example block diagram of a system for generating a mappingspecification for mapping front-end incoming user requests to outgoingback-end requests in accordance with one illustrative embodiment. Theoperational elements shown in FIG. 3, and other block diagramshereafter, may be implemented as software, hardware, or any combinationof software and hardware. In one illustrative embodiment, theoperational elements in FIG. 3 are implemented as software instructionsexecuting on one or more computing devices. Data structures and the likeshown in FIG. 3 may be stored in data storage devices within orassociated with these one or more computing devices. Depictions ofnetworks are intended to represents data communication networks whichmay be of the same or different types and may comprise more than onedata communication network. The data communication networks may be localarea networks, wide area networks, the Internet, or any other known orlater developed type of data communication network.

The following description will assume that the mechanisms of theillustrative embodiments are applied to accesses to a back-end databasesystem. However, it should be appreciated that the mechanisms of theillustrative embodiments are not limited to such. Rather, theillustrative embodiments may be used with any system in which requeststo a front-end application are processed to generate requests/statementsthat are sent to a back-end system and thus, a mapping of incomingrequests to outgoing requests/statements is desirable.

In addition, it should be appreciated that while the followingdescription will assume that Structured Query Language (SQL) statementsare generated by the front-end application based on incoming userrequests (which may be HTTP requests or the like), the illustrativeembodiments are not limited to such. To the contrary, any system inwhich incoming requests are processed to generate a set of outgoingrequests, regardless of the language or protocols used, may implementthe mechanisms of the illustrative embodiments.

As shown in FIG. 3, the mechanisms of the illustrative embodimentsfurther includes a gateway system 310 used for intercepting incominguser requests 315 from the client computing device 305 to theapplication front-end 320 and an inspection mechanism 330 for inspectingoutgoing database requests/statements 325 sent from the applicationfront-end 320 to the database back-end 340. The gateway system 310,during a learning mode of operation, intercepts the incoming userrequests 315 and parses the protocol of the incoming user request 315using the parser 312. The parsed incoming user request 315 is thenprocessed to identify where application values are present, e.g.,account numbers, names, etc. For example, the gateway system 310 mayhave an application value rules data structure 314, or the like, thatidentifies application values, e.g., the variable names, data formatlocation, or the like, of interest and the gateway system 310 may applythese rules 314 to the parsed incoming user requests 315 to identify theapplication values in the incoming user request from the clientcomputing device 305.

The unique value insertion logic 316 of the gateway mechanism 310modifies these values by inserting or “planting” uniquely identifiablevalues (e.g., randomly generated large strings, SHA-1 values, or thelike) into the incoming user requests to replace the account numbers,names, or the like. During a learning mode of operation, the content ofthe requests are not of importance, only the ability to match incominguser requests with the outgoing requests/statements generated by theapplication front-end 320. Thus, values that will typically be passedthrough the application front-end 320 to the database back-end system340 may be identified using the parser 312 and application value rulesdata structure 314 and may be replaced with uniquely identifiablevalues.

These uniquely identifiable values are generated such that, within apredetermined period of time (which may be selected such that the periodof time is relatively large compared to the amount of time of a typicalsession established with the application front-end 320), the uniquelyidentifiable value will not be repeated. Each incoming user request willhave its own uniquely identifiable value(s) such that it can be uniquelydistinguished from other requests being handled by the applicationfront-end 320 within the predetermined period of time.

The modification of the application values to be uniquely identifiablevalues is a key aspect of the learning mode of operation of themechanisms of the illustrative embodiments. It should be appreciatedthat there are systems, e.g., Oracle Secerno, available from OracleCorporation, or SecureSphere available from Imperva, that performmatching between incoming user requests and outgoing databaserequests/statements. These systems extract timestamps and values fromthe incoming user requests and match them to similar values in theoutgoing database requests/statements. If values are seen on both theincoming user request and on the outgoing database requests/statements,then a match can be made and the system can infer that this particularincoming user request caused the database request(s)/statement(s) to begenerated.

The Oracle Secerno and Imperva SecureSphere systems, and those likethem, are very inaccurate in that the values received in the incominguser requests do not often match the values in the outgoing databaserequests/statements because of application-layer processing. Moreover,timing can be an issue since the values are not unique and more than oneincoming user request can have the same values that may be included inthe outgoing database requests/statements. That is, values in theincoming user requests are often not included in the outgoing databaserequest(s)/statement(s) or are changed in some manner such that theycannot be match appropriately. Furthermore, there is an assumption withregard to timing, e.g., a first arriving incoming user request willmatch to a first outgoing database request/statement that has a matchingvalue. However, if more than one incoming user request is being handledby the application-layer, as is common, then it is possible that theoutgoing database requests/statements may be intermingled with regard totiming and may have common values, leading to a mismatch where anoutgoing database request/statement that is actually associated with afirst incoming user request is matched to a second incoming user requesterroneously.

Thus, with the mechanisms of the illustrative embodiments, uniquelyidentifiable values are generated and inserted or “planted” into theincoming user requests 315 before they are passed through theapplication-layer processing performed by the application front-endsystem 320. A record of these uniquely identifiable values, and thecorresponding incoming user request, which includes a sessionidentifier, is communicated by the gateway system 310 to the inspectionsystem 330. In this way, if the application-layer processing outputscorresponding outgoing database requests/statements 325, then theuniquely identifiable values will be included in these outgoing databaserequests/statements 325 such that they may be uniquely matched even ifthe application-layer is processing multiple incoming user requests fromthe same or different client computing devices 305. In other words, theproblems associated with the assumptions of the known Oracle Secerno,Imperva SecureSphere, and similar known matching mechanisms areeliminated by the mechanisms of the illustrative embodiments. Forexample, if there are multiple requests all accessing a same itemnumber, using the mechanisms of the illustrative embodiments, the itemnumber is replaced with a uniquely identifiable value in each requestsuch that each request is separately identifiable and able to becorrelated with its particular outgoing requests/statements sent to thedatabase back-end system 340.

The gateway system 310 sends the incoming user request 315 to theinspection system 330 along with the unique value corresponding to theincoming user request 315. The incoming user request 315 is provided tothe inspection system 330 for use in generating a mapping from thisincoming user request 315 to resulting outgoing requests/statements 325.The inspection system 330 stores the incoming user request, or at leastan identifier of the user request, and its associated unique values asobtained from the user request, and the like, in a mapping specificationdata structure 336.

The inspection system 330 inspects the outgoing requests/statements 325,e.g., SQL statements, generated by the application front-end 320 basedon the incoming user requests 315 received by the application front-end320. These outgoing requests/statements 325 are parsed by the parser 332and the mapping logic 334 analyzes the parsed outgoingrequests/statements 325 to look specifically for the unique values thatwere inserted into the incoming user requests 315 that were interceptedby the gateway mechanism 310 prior to the requests being processed bythe application-layer application front-end 320. That is, the mappinglogic 334 extracts values from the parsed outgoing requests/statements325 and compares them to a listing of unique values communicated to theinspection system 330 by the gateway system 310 and stored in themapping specification data structure 336. If there is a matching uniquevalue in the mapping specification data structure 336, then the mappinglogic 334 adds the outgoing request/statement 325, or at least anidentifier of the outgoing request/statement 325, to a list of outgoingrequest/statements in the mapping specification data structure 336 forthe particular incoming user request 315. This list may be built up witheach subsequent outgoing request/statement having a matching uniquevalue is detected by the inspection system 330. The result is a mappingof the incoming user request 315 to the one or more outgoingrequests/statements 325 having the same unique value.

The detection of these unique values in the outgoing requests/statements325 being sent to the back-end database system 340 is correlated withthe unique values in the incoming user requests 315. This correlationleads to the generation of a mapping between incoming user requests 315and the resulting outgoing requests/statements 325. That is, the mappingidentifies an input pattern of incoming user requests 315 and acorresponding pattern of output requests/statements 325 based on theinserted or “planted” unique values. The end result is a specification,or set of specifications, on how sequences of incoming user requests 315are associated with outgoing requests/statements 325. For example, anincoming user request sequence of A, B, C may be mapped to, or causes, asequence of outgoing requests/statements of X1, X2, X3, X4, X5, X6, andX7 to be generated and thus, a mapping from A, B, C, to X1, X2, X3, X4,X5, X6, and X7 can be established and stored for later use in analyzingaccesses to the database back-end.

This process of mapping by the gateway and inspection mechanisms 310 and330 may be performed for a majority, or even all, of the code paths ofthe application front-end 320 using a staging or testing environment.For example, there are known mechanisms for testing the various codepaths of application code for purposes of verification, tracing, and thelike. These mechanisms may be augmented or otherwise utilized with themechanisms of the illustrative embodiments to generate a mapping ofincoming user requests 315 to outgoing requests/statements 325 targetinga database back-end system 340.

It should be noted that the various systems and devices shown in FIG. 3,and the figures hereafter, may be implemented on the same dataprocessing system or on a plurality of different data processingsystems. For example, the client computing device 305 may be a separatecomputing device from the gateway system 310 which may be on a differentsystem from the application front-end system 320, inspection system 330,and database back-end system 340. Alternatively, the gateway system 310and application front-end system 320 may be implemented on the same dataprocessing system, the inspection system 330 and database back-endsystem 340 may together be provided on a separate data processingsystem, and the client computing device 305 may be yet another dataprocessing system. Any combination of elements shown in FIG. 3 may beprovided on the same or different data processing systems withoutdeparting from the spirit and scope of the illustrative embodiments.

The output of the above mapping process is a specification, or set ofspecifications, that defines how the application front-end behaves as asort of “black box.” That is, the specification(s) specify, given a setof inputs, the “black box” generates a particular set of outputs. Thisspecification, or set of specifications, can then be used at runtime forauditing accesses to the back-end database system 340. In other words,the specification or set of specifications generated during the learningmode of operation may be input to an auditing mechanism for use inperforming audit operations on accesses to a back-end database system340. The auditing mechanism may operate at the database layer ratherthan at the application layer. The auditing mechanism may use themappings in the specification(s) and may further obtain information fromthe front-end application 320 to thereby identify the particular usersor client devices that are accessing sensitive information in theback-end database system 340.

FIG. 4 is an example block diagram of a system for auditing accesses toa back-end system using mapping information generated during a learningmode of operation in accordance with one illustrative embodiment. Thegateway system 310 and inspection system 330 may be configured to run ina runtime mode of operation such that newly configured gateway system410 and inspection system 430 are shown in FIG. 4, which correspond toelements 310 and 330 in FIG. 3 but reconfigured for runtime operation.As shown in FIG. 4, the inspection system 430 includes additionalruntime components including audit logic 432 and access control logic434. These elements may make use of the mapping specification datastructure 436 which may correspond to the mapping specification datastructure 336 in FIG. 3.

During runtime, the gateway system 410 relays incoming user requests tothe inspection system 430 in a similar manner as it did during thelearning mode of operation. In addition, the front-end application 420stores the end user credentials and corresponding session identifiers ina user credentials data structure 422 and thus, knows the usercredentials associated with the incoming user requests 415. That is, thesession identifier, which is included in the incoming user requests 415by virtue of having established a connection with the applicationfront-end 420 in a known manner, may be used as a basis for identifyingthe corresponding user credentials stored in this user credentials datastructure 422. It should be appreciated that both in the learning modeof operation and the runtime mode of operation, the actual functionalityof the application front-end 420 is not changed and there is no need tomodify the code of the application front-end 420 to achieve thefunctionality of the present invention. Thus, the maintaining of sessionidentifiers and user identifiers in the session id/user id datastructure 422 does not constitute a change in the operation of theapplication front-end 420 from that of known application front-endsystems. However, the illustrative embodiments utilize this informationin a new and different manner during runtime operation.

The incoming user requests 415 relayed by the gateway system 410 to theinspection system 430 during a runtime mode of operation are the same instructure as the incoming user requests 315 relayed during the learningmode of operation. The difference between these requests 315 and 415 isthe values within the requests 315 and 415. The requests 315 relayedduring the learning mode of operation have their application valuesreplaced with unique values for mapping purposes. The requests 415relayed during the runtime mode of operation are not modified and thus,have the original application values.

The inspection system 430 not only receives the original incoming userrequest 415 relayed by the gateway system 410, but also the resultingoutgoing requests/statements 425 generated by the processing of theincoming user request 415 by the application front-end 420. The patternof outgoing requests/statements 425 received in the inspection system430 may be matched, by the audit logic 432 or access control logic 434,to an entry in the mapping specification data structure 436 to identifya type of incoming user request 415, or in some illustrativeembodiments, a pattern of one or more incoming user requests 415,matching the pattern of outgoing requests/statements 425. This type ofincoming user request, or pattern of one or more incoming user requests,may then be matched to an actual incoming user request 415 relayed tothe inspection system 430. The session identifier in the identifiedactual incoming user request 415 may be correlated with a useridentifier using the session identifier/user identifier data structure422, which may be accessed by the inspection system 430 or provided tothe inspection system 430 by the application front-end 420.

The user identifier may then be used by the audit logic 432 or accesscontrol logic 434 to perform appropriate operations in the data layer.For example, the audit logic 432 may generate audit records in an auditrecord data structure (not shown) that identifies which users accessedwhich portions of the database back-end system 440 and therequests/statements corresponding to these accesses from a data layerperspective. The access control logic 434 may control access to thedatabase back-end system 440 based on the identified user. In oneexample, if the database back-end system 440 detects a data leakscenario, the access control logic 434 may use the mapping specificationdata structure 436 information and the correlation mechanisms describedabove to instruct the application front-end 420 to terminate the usersession, based on the session identifier.

For example, assume that while inspecting the database access layer, themechanisms of the inspection system 430 notices a SQL injection attackthat causes a large set of records to be extracted from the databaseback-end system 440 as the result set of the query that was created bythe SQL injection attack. In this case, the database back-end system 440may not want to terminate the database connection with the applicationfront-end system 420 because it is used by the application front-endserver. However, with the mechanisms of the illustrative embodiments,the inspection system 430 knows which user request generated the querythat resulted in the SQL injection attack using the mechanisms describedabove. Thus, the access control logic 434 of the inspection system 430may operate to prevent the returning of the large number of records tothe attacker as part of the SQL injection attack by instructing thegateway system 410 to tear down the connection between the clientcomputing device 405 and the application front-end system 420.

It is important to note that, in this case, the identification of theattack occurs is on one layer (in a SQL injection attack or a large dataextract the layer where this would be seen is data layer) but the layerin which termination needs to occur is in a different layer (in thiscase the application layer). Known mechanisms try to identify attacksand terminate these attacks in the same layer which causes errors and isgenerally faulty. The ability to identify an attack in one layer buthave a deterministic and precise mapping to the another layer so thatone can effect good termination of the attack is a significant benefitprovided by the mechanisms of the illustrative embodiments.

Thus, the illustrative embodiments provide mechanisms for propagatinguser identifier information from an application front-end system in anapplication layer to data layer mechanisms, e.g., audit and/or accesscontrol mechanisms, operating in a data layer. In this way, data layermechanisms may correlate accesses to back-end systems with particularuser identifiers rather than functional identifiers of the applicationfront-end system. As a result, accurate audits can be performed at thedata layer and access control functions can be performed based on theuser identifier information for connections rather than the functionalidentifier of the application front-end system.

FIG. 5 is a flowchart outlining an example operation of a gateway systemduring a learning mode of operation in accordance with one illustrativeembodiment. As shown in FIG. 5, the gateway system receives an incominguser request from a client computing device (step 510). The gatewaysystem then parses the request and identifies any application values inthe request that are likely to be passed through the applicationfront-end system in outgoing requests/statements to a back-end system(step 520). The identified application values are then replaced with auniquely identifiable value (step 530). The resulting modified requestis forwarded to the application front end and the inspection system(step 540). The operation of the gateway system with regard to thisreceived incoming user request is then ended. It should be appreciatedthat this process may be repeated for each subsequently receivedincoming user request during a learning mode of operation. Although notshown in FIG. 5, the application front-end receives the modified requestand processes it in a normal fashion so as to generate outgoingrequest(s)/statement(s) that target a back-end system, e.g., a back-enddatabase system or the like.

FIG. 6 is a flowchart outlining an example operation of an inspectionsystem during a learning mode of operation in accordance with oneillustrative embodiment. As shown in FIG. 6, the operation starts withthe inspection system receiving outgoing request(s)/statement(s)generated by a front-end application system (step 610) and a modifiedincoming user request as forwarded by the gateway system (step 620). Theoutgoing request(s)/statement(s) are parsed for the unique values (step630) and any found unique values are compared to those stored in themapping data structure (step 640). If there is a matching entry found inthe mapping data structure 640 based on the unique values (step 650),then the outgoing request(s)/statement(s) are added to the matchingentry for the particular corresponding incoming user request (step 660).If there is not a match, then the operation terminates. It should beappreciated that this process can be repeated for each new outgoingrequest/statement or group of request(s)/statement(s) received by theinspection system.

The above process generates a mapping data structure that maps incominguser request patterns to outgoing request/statement patterns which maythen be used during runtime to propagate user identifier information toback-end audit, access control, and other back-end processes. Thegateway system and inspection system may be reconfigured to a runtimemode of operation to perform such pattern matching.

FIG. 7 is a flowchart outlining an example operation of a gateway systemduring a runtime mode of operation in accordance with one illustrativeembodiment. As shown in FIG. 7, the gateway system receives an incominguser request (step 710) and then simply forwards the incoming userrequest to the application front-end system and inspection system (step720). Thus, in a runtime mode of operation, the gateway system operatesprimarily as a pass-through entity with the exception that the gatewaysystem forwards the incoming user request to the inspection system aswell as the application front-end.

FIG. 8 is a flowchart outlining an example operation of an inspectionsystem during a runtime mode of operation in accordance with oneillustrative embodiment. As shown in FIG. 8, the inspection systemreceives outgoing request(s)/statement(s) from the application front-endsystem (step 810) and the original incoming user request from thegateway system (step 820). The inspection system compares the pattern ofoutgoing request(s)/statement(s) to entries in the mapping datastructure to identify a match (step 830). This match may not necessarilybe a precise match but instead may be a match within a given tolerance.That is, the pattern in the entry may differ from the pattern of thereceived outgoing requests by a predetermined acceptable amount, i.e. atolerance, and still be considered to be a match.

If there are no matching entries, the operation terminates. However, itshould be appreciated that this process may be repeated for eachsubsequently received outgoing request/statement or group of outgoingrequests/statements.

If there is a matching entry found (step 840), then an incoming userrequest having the same type, or pattern of one or more incoming userrequests, as the matched entry is identified (step 850). A lookupoperation is performed, based on the session identifier of the matchedincoming user request, to identify a user identifier corresponding tothe matched incoming user request (step 860). A data layer operation isthen performed based on the propagated user identifier information (step870). For example, this data layer operation may include an auditmechanism generating an audit record using the user identifierinformation propagated using the mechanisms of the illustrativeembodiments. As another example, access control mechanisms may controlaccess to data in the back-end system based on this user identifierinformation or may instruct the application front-end to modifyconnections based on this user identifier information. Other types ofdata layer operations may be performed without departing from the spiritand scope of the illustrative embodiments.

Thus, the mechanisms of the illustrative embodiments allow propagationof user identifier information from an application layer to a data layerso that analysis of the data layer operations can be performed withinthe context of this user identifier information. As mentionedpreviously, with known mechanisms, this user identifier information islost at the data layer and is not accurately obtainable. The mechanismsof the illustrative embodiments utilize a learning process based onunique values to generate pattern matching specifications that canaccurately correlate patterns of outgoing requests/statements withincoming user requests without modifying the operation or code of theapplication front-end and back-end systems.

It should be appreciated that while the illustrative embodiments aredescribed in terms of propagating user identifier information, theillustrative embodiments are not limited to such. Rather, anyinformation that is available in one layer of processing that may be ofinterest to another layer of processing may be propagated using themechanisms of the illustrative embodiments. For example, with regard tosecurity, other types of information that may be propagated using themechanisms of the illustrative embodiments include client IP address,host name, operating system user name logged on at the client, or anyother information that can assist in identifying who and from where arequest is being made.

As noted above, it should be appreciated that the illustrativeembodiments may take the form of an entirely hardware embodiment, anentirely software embodiment or an embodiment containing both hardwareand software elements. In one example embodiment, the mechanisms of theillustrative embodiments are implemented in software or program code,which includes but is not limited to firmware, resident software,microcode, etc.

A data processing system suitable for storing and/or executing programcode will include at least one processor coupled directly or indirectlyto memory elements through a system bus. The memory elements can includelocal memory employed during actual execution of the program code, bulkstorage, and cache memories which provide temporary storage of at leastsome program code in order to reduce the number of times code must beretrieved from bulk storage during execution.

Input/output or I/O devices (including but not limited to keyboards,displays, pointing devices, etc.) can be coupled to the system eitherdirectly or through intervening I/O controllers. Network adapters mayalso be coupled to the system to enable the data processing system tobecome coupled to other data processing systems or remote printers orstorage devices through intervening private or public networks. Modems,cable modems and Ethernet cards are just a few of the currentlyavailable types of network adapters.

The description of the present invention has been presented for purposesof illustration and description, and is not intended to be exhaustive orlimited to the invention in the form disclosed. Many modifications andvariations will be apparent to those of ordinary skill in the art. Theembodiment was chosen and described in order to best explain theprinciples of the invention, the practical application, and to enableothers of ordinary skill in the art to understand the invention forvarious embodiments with various modifications as are suited to theparticular use contemplated.

1-25. (canceled)
 26. A method comprising: receiving, by a gatewaycomputing system, a plurality of first application requests relating toa first application; in response to receiving the plurality of firstapplication requests, processing, by the gateway computing system, eachfirst application request in the plurality of first application requestsat least by: parsing the first application request to identify at leastone application value in the first application request; replacing the atleast one application value in the first application request with auniquely identifiable value to generate a modified first applicationrequest; and processing the modified first application request throughthe gateway computing system; subsequent to each first applicationrequest, receiving, by the gateway computing system and from a firstdatabase tier of a first database in a database computing system, arespectively corresponding plurality of database requests relating toaccess of data of the first database tier by the first application; anddetermining, by machine logic of the gateway computing system, a firstmapping between the first application and a first mapped plurality ofdatabase requests, with the determination being based upon the pluralityof first application requests and the plurality of database requestsrespectively corresponding to each first application request asdetermined from monitoring, by the gateway computing system, thereceived plurality of database requests, for the uniquely identifiablevalues associated with the first application requests in the pluralityof first application requests.
 27. The method of claim 26 furthercomprising: responsive to the first mapping, propagating, by the gatewayand to a plurality of system components, first identity propagation dataincluding information indicative of: (i) an identity of the firstapplication, and (ii) causation of operation(s) in the first databasetier by the first application.
 28. The method of claim 27 wherein: theidentity of the first application includes user credentialscorresponding to a first user, and the first identity propagation dataincludes information identifying the first user.
 29. The method of claim26, further comprising: receiving, at a data layer inspection systemassociated with the database computing system, an incoming user requestfrom the gateway computing system; receiving, at the data layerinspection system, one or more database requests targeting the firstdatabase and being generated by an application front-end system based onthe received incoming user request; accessing, by the data layerinspection system, a mapping data structure comprising the firstmapping, based on the one or more database requests to thereby correlatethe one or more database requests with the incoming user request,wherein the correlation is performed at least by matching a pattern ofthe one or more database requests to an entry in the mapping datastructure, wherein each entry in the mapping data structure maps apattern of database requests to a corresponding type of incoming userrequest; retrieving, by the data layer inspection system, sourceidentification information associated with the incoming user requestbased on the correlation of the one or more database requests with theincoming user request; and performing, by the data layer inspectionsystem, a data layer inspection operation based on the sourceidentification information.
 30. The method of claim 29, whereinaccessing the mapping data structure comprises performing a lookup of anentry in the mapping data structure that has a pattern of databaserequests that matches a pattern of the received one or more databaserequests.
 31. The method of claim 30, wherein accessing the mapping datastructure further comprises: retrieving a type or pattern of one or moreincoming user requests specified in the entry; and matching a type orpattern of the received incoming user request to a retrieved type orpattern specified in the entry.
 38. The method of claim 26, whereindatabase requests having the uniquely identifiable value are added to anentry in a mapping data structure corresponding to the first applicationrequest, and wherein a series of database requests stored in the entrycorresponding to the first application request constitute a pattern ofdatabase requests.
 39. The method of claim 29, wherein the data layerinspection operation is a data layer audit operation that generates anaudit log of accesses to the back-end system, and wherein the audit logcomprises the source identification information.
 40. The method of claim29, wherein the incoming user request is a hypertext transport protocol(HTTP) request targeting an application front-end system, and thedatabase requests are Structured Query Language (SQL) statementsgenerated by the application front-end system based on the HTTP request.41. A computer program product comprising a non-transitory computerreadable medium having a computer readable program stored therein,wherein the computer readable program, when executed on a computingdevice, causes the computing device to: receive, by a gateway executingon the computing device, a plurality of first application requestsrelating to a first application; process, by the gateway in response toreceiving the plurality of first application requests, each firstapplication request in the plurality of first application requests atleast by: parsing the first application request to identify at least oneapplication value in the first application request; replacing the atleast one application value in the first application request with auniquely identifiable value to generate a modified first applicationrequest; and processing the modified first application request throughthe gateway; subsequent to each first application request, receive, bythe gateway and from a first database tier of a first database in adatabase computing system, a respectively corresponding plurality ofdatabase requests relating to access of data of the first database tierby the first application; and determining, by machine logic of thegateway, a first mapping between the first application and a firstmapped plurality of database requests, with the determination beingbased upon the plurality of first application requests and the pluralityof database requests respectively corresponding to each firstapplication request as determined from monitoring, by the gateway, thereceived plurality of database requests, for the uniquely identifiablevalues associated with the first application requests in the pluralityof first application requests.
 42. The computer program product of claim41 wherein the computer readable program further causes the computingdevice to: responsive to the first mapping, propagate, by the gatewayand to a plurality of system components, first identity propagation dataincluding information indicative of: (i) an identity of the firstapplication, and (ii) causation of operation(s) in the first databasetier by the first application.
 43. The computer program product of claim42 wherein: the identity of the first application includes usercredentials corresponding to a first user, and the first identitypropagation data includes information identifying the first user. 44.The computer program product of claim 41, wherein the computer readableprogram further causes the computing device to: receive, at a data layerinspection system associated with the database computing system, anincoming user request from the gateway computing system; receive, at thedata layer inspection system, one or more database requests targetingthe first database and being generated by an application front-endsystem based on the received incoming user request; access, by the datalayer inspection system, a mapping data structure comprising the firstmapping, based on the one or more database requests to thereby correlatethe one or more database requests with the incoming user request,wherein the correlation is performed at least by matching a pattern ofthe one or more database requests to an entry in the mapping datastructure, wherein each entry in the mapping data structure maps apattern of database requests to a corresponding type of incoming userrequest; retrieve, by the data layer inspection system, sourceidentification information associated with the incoming user requestbased on the correlation of the one or more database requests with theincoming user request; and perform, by the data layer inspection system,a data layer inspection operation based on the source identificationinformation.
 45. The computer program product of claim 44, wherein thecomputer readable program further causes the computing device to accessthe mapping data structure at least by performing a lookup of an entryin the mapping data structure that has a pattern of database requeststhat matches a pattern of the received one or more database requests.46. The computer program product of claim 45, wherein the computerreadable program further causes the computing device to access themapping data structure further at least by: retrieving a type or patternof one or more incoming user requests specified in the entry; andmatching a type or pattern of the received incoming user request to aretrieved type or pattern specified in the entry.
 47. The computerprogram product of claim 41, wherein database requests having theuniquely identifiable value are added to an entry in a mapping datastructure corresponding to the first application request, and wherein aseries of database requests stored in the entry corresponding to thefirst application request constitute a pattern of database requests. 48.The computer program product of claim 44, wherein the incoming userrequest is a hypertext transport protocol (HTTP) request targeting anapplication front-end system, and the database requests are StructuredQuery Language (SQL) statements generated by the application front-endsystem based on the HTTP request.
 49. A system comprising: at least oneprocessor; and at least one memory coupled to the at least oneprocessor, wherein the at least one memory comprises instructionsexecuted by the at least one processor that cause the at least oneprocessor to: receive, by a gateway executing on the at least oneprocessor, a plurality of first application requests relating to a firstapplication; process, by the gateway, in response to receiving theplurality of first application requests, each first application requestin the plurality of first application requests at least by: parsing thefirst application request to identify at least one application value inthe first application request; replacing the at least one applicationvalue in the first application request with a uniquely identifiablevalue to generate a modified first application request; and processingthe modified first application request through the gateway; subsequentto each first application request, receiving, by the gateway and from afirst database tier of a first database in a database computing system,a respectively corresponding plurality of database requests relating toaccess of data of the first database tier by the first application; anddetermining, by machine logic of the gateway, a first mapping betweenthe first application and a first mapped plurality of database requests,with the determination being based upon the plurality of firstapplication requests and the plurality of database requests respectivelycorresponding to each first application request as determined frommonitoring, by the gateway, the received plurality of database requests,for the uniquely identifiable values associated with the firstapplication requests in the plurality of first application requests. 50.The system of claim 49 wherein the instructions further cause the atleast one processor to: responsive to the first mapping, propagate, bythe gateway and to a plurality of system components, first identitypropagation data including information indicative of: (i) an identity ofthe first application, and (ii) causation of operation(s) in the firstdatabase tier by the first application.
 51. The system of claim 50wherein: the identity of the first application includes user credentialscorresponding to a first user, and the first identity propagation dataincludes information identifying the first user.